refactor: extract create_payment_request (#3240)

lnbits/core/views/payment_api.py

@@ -62,8 +62,7 @@ from ..crud import (
     get_wallet_for_key,
 )
 from ..services import (
-    create_fiat_invoice,
-    create_wallet_invoice,
+    create_payment_request,
     fee_reserve_total,
     get_payments_daily_stats,
     pay_invoice,
@@ -261,10 +260,7 @@ async def api_payments_create(
         )
 
     # If the payment is not outgoing, we can create a new invoice.
-    if invoice_data.fiat_provider:
-        return await create_fiat_invoice(wallet_id, invoice_data)
-
-    return await create_wallet_invoice(wallet_id, invoice_data)
+    return await create_payment_request(wallet_id, invoice_data)
 
 
 @payment_router.get("/fee-reserve")